Applied Chemistry for Engineering (공업화학)

The Korean Society of Industrial and Engineering Chemistry (한국공업화학회)
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Reuse of Waste Activated Sludge from Livestock Wastewater Treatment Process using Thermal and Ozone Oxidation Treatment Method

열처리 및 오존산화처리를 이용한 축산폐수처리장 폐활성오니의 재활용

  • Kim, Young-Kee (Department of Chemical Engineering, Hankyong National University) ;
  • Nam, Se-Yong (Department of Environmental Engineering, Hankyong National University) ;
  • Kim, Kyung-Sub (Department of Environmental Engineering, Hankyong National University)
  • Received : 2005.06.02
  • Accepted : 2005.11.24
  • Published : 2006.02.10
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Abstract

Thermal treatment and ozone oxidation methods were examined to reuse waste activated sludge (WAS) produced from a livestock wastewater treatment plant. Analysis of WAS property was made to study usefulness of the recycled waste as fertilizer. From the results of quantitative analysis, WAS particles were found to be composed of 44.25 wt% carbon, 8.43 wt% nitrogen, and 1.35 wt% phosphorus. It was confirmed that the inactivation of pathogenic microorganism was required from the quantitative analysis of microbes. From the results of TSS, COD, SCOD, and pathogenic microorganism measurement, the optimal operating conditions of thermal treatment and ozone oxidation were determined to be 70, 10 min and $0.6L\;O_3/L\;solution{\cdot}min$, 60 min, respectively. The optimized thermal treatment and ozone oxidation represented the efficient pathogen inactivation and particle dissolution, respectively. However, the two methods examined were not themselves sufficient but they need to combine with another treatment for the effective reuse of wastes.

축산폐수처리과정에서 발생하는 부산물인 폐활성오니를 농업용으로 재활용하기 위하여 유효성분을 분석하고, 재활용을 위한 처리기법으로 열처리와 오존산화처리에 대한 실험을 수행하였다. 폐활성오니의 성상분석 결과로부터 고형분의 질량백분율로 탄소 44.25%, 질소 8.43%, 인 1.35%로 농업용 비료로서의 가치를 확인하였다. 잠재 병원성균의 정량분석결과로부터 적절한 처리방법에 의한 병원성균 비활성화의 필요성을 확인하였다. 열처리방법의 TSS, COD, SCOD, 병원성균 처리효율을 분석하여 최적 운전조건으로 $70^{\circ}C$, 10 min으로 결정하였다. 오존산화 처리후의 TSS, COD, SCOD, 병원성균 처리효율을 분석한 결과 최적 운전조건으로 $0.6L\;O_3/L\;solution{\cdot}min$, 60 min을 결정하였다. 최적 운전조건의 열처리방법과 오존산화방법의 처리효율 비교분석으로 열처리방법의 우수한 병원성균 비활성화 효과와 오존산화방법의 상대적으로 우수한 고형분 감량 및 유기물 용해효과를 검증하였다. 하지만 두 방법이 가지는 단점으로 인하여 폐활성오니 재활용을 위한 효과적 처리를 위해서는 다른 처리방법과의 조합이 바람직하다.

Keywords

Acknowledgement

Supported by : 한경대학교

References

  1. 환경부, 2005 환경통계연감, 제18호 (2005)
  2. 환경부, 2003 오수.분뇨 처리통계 (2004)
  3. 환경부, 축산폐수 처리통계 (2004)
  4. J. A. Hudson and P. Lowe, J. Ciwem, 10, 436 (1996)
  5. J. Jung, X. H. Xing, and K. Matsumoto, Biochem. Eng. J., 8, 1(2001) https://doi.org/10.1016/S1369-703X(00)00123-6
  6. Y. K. Kim, M. S. Kwak, W. H. Lee, and J. W. Choi, Biotech. Bioprocess Eng., 5, 469 (2000) https://doi.org/10.1007/BF02931950
  7. Y. K. Kim, Y. S. Eom, B. K. Oh, W. H. Lee, and J. W. Lee, J. Microbial. Biotechnol., 11, 570 (2001)
  8. Y. K. Kim, M. S. Kwak, S. B. Lee, W. H. Lee, and J. W. Choi, J. Environ. Eng., 128, 755 (2002) https://doi.org/10.1061/(ASCE)0733-9372(2002)128:8(755)
  9. P. Lowe, J. Ciwem, 9, 306 (1995)
  10. E. Veschetti, D. Maresca, A. Santarsiero, and M. Ottaviani, Microchem. J., 59, 246 (1998) https://doi.org/10.1006/mchj.1998.1613
  11. M. Rocher, G. Goma, A. Pilas Begue, L. Louvel, and J. L. Rols, Appl. Microbial. Biotechnol., 51, 883 (1999) https://doi.org/10.1007/s002530051478
  12. J.-G. Lin, Y.-S. Ma, and C.-C. Huang, Bioresour. Technol., 65, 35 (1998) https://doi.org/10.1016/S0960-8524(98)00028-5
  13. 농촌진흥청고시 제2002-23호, 비료공정규격 (2002)